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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_LIBDEXFILE_DEX_METHOD_REFERENCE_H_
#define ART_LIBDEXFILE_DEX_METHOD_REFERENCE_H_
#include <cstring>
#include <stdint.h>
#include <string>
#include "dex/dex_file.h"
#include "dex/dex_file_reference.h"
namespace art {
// A method is uniquely located by its DexFile and the method_ids_ table index into that DexFile
class MethodReference : public DexFileReference {
public:
MethodReference(const DexFile* file, uint32_t index) : DexFileReference(file, index) {}
std::string PrettyMethod(bool with_signature = true) const {
return dex_file->PrettyMethod(index, with_signature);
}
const dex::MethodId& GetMethodId() const {
return dex_file->GetMethodId(index);
}
};
// Compare the actual referenced method signatures. Used for method reference deduplication.
struct MethodReferenceValueComparator {
bool operator()(MethodReference mr1, MethodReference mr2) const {
if (mr1.dex_file == mr2.dex_file) {
DCHECK_EQ(mr1.index < mr2.index, SlowCompare(mr1, mr2));
return mr1.index < mr2.index;
} else {
return SlowCompare(mr1, mr2);
}
}
bool SlowCompare(MethodReference mr1, MethodReference mr2) const {
// The order is the same as for method ids in a single dex file.
// Compare the class descriptors first.
const dex::MethodId& mid1 = mr1.GetMethodId();
const dex::MethodId& mid2 = mr2.GetMethodId();
int descriptor_diff = std::strcmp(mr1.dex_file->StringByTypeIdx(mid1.class_idx_),
mr2.dex_file->StringByTypeIdx(mid2.class_idx_));
if (descriptor_diff != 0) {
return descriptor_diff < 0;
}
// Compare names second.
int name_diff = std::strcmp(mr1.dex_file->GetMethodName(mid1), mr2.dex_file->GetMethodName(mid2));
if (name_diff != 0) {
return name_diff < 0;
}
// And then compare proto ids, starting with return type comparison.
const dex::ProtoId& prid1 = mr1.dex_file->GetProtoId(mid1.proto_idx_);
const dex::ProtoId& prid2 = mr2.dex_file->GetProtoId(mid2.proto_idx_);
int return_type_diff = std::strcmp(mr1.dex_file->StringByTypeIdx(prid1.return_type_idx_),
mr2.dex_file->StringByTypeIdx(prid2.return_type_idx_));
if (return_type_diff != 0) {
return return_type_diff < 0;
}
// And finishing with lexicographical parameter comparison.
const dex::TypeList* params1 = mr1.dex_file->GetProtoParameters(prid1);
size_t param1_size = (params1 != nullptr) ? params1->Size() : 0u;
const dex::TypeList* params2 = mr2.dex_file->GetProtoParameters(prid2);
size_t param2_size = (params2 != nullptr) ? params2->Size() : 0u;
for (size_t i = 0, num = std::min(param1_size, param2_size); i != num; ++i) {
int param_diff = std::strcmp(mr1.dex_file->StringByTypeIdx(params1->GetTypeItem(i).type_idx_),
mr2.dex_file->StringByTypeIdx(params2->GetTypeItem(i).type_idx_));
if (param_diff != 0) {
return param_diff < 0;
}
}
return param1_size < param2_size;
}
};
} // namespace art
#endif // ART_LIBDEXFILE_DEX_METHOD_REFERENCE_H_
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